The scores on a certain test are normally distributed with a mean score of 43 and a standard deviation of 3. what is the probability that a sample of 90 students will have a mean score of at least 43.3162?
0.8413
0.3174
0.1587
0.3413

0.1587

Step-by-step explanation:

Given: Mean :

Standard deviation :

Sample size : n = 90

We know that , the value of z is given by :-

For x=4.2

The p value =

Hence, the probability that a sample of 90 students will have a mean score of at least 43.3162= 0.1587

d) 30 units^2

area of rectangle = l × b

we know,

length = 10 unit

breadth = 3 unit

applying the formula,

= l × b

= 10 × 3

= 30 unit^2

happy to

pls mark as brainliest

pay attention in your classes and concentrate the best thing you can do to raise your test scores is to pay attention when you're supposed to be learning the material: in class!

take good notes.

do your homework.

use mnemonics and other tricks.

do practice tests.

note: the best i know.